R<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub> と (R<sub>1-<i>x</i></sub>Eu<sub><i>x</i></sub>)<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub>の結晶構造と螢光特性

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  • Crystal Structure and Fluorescence Properties of R<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub> and (R<sub>1-<i>x</i></sub>Eu<sub><i>x</i></sub>)<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub> Compounds
  • R2Zr2O7 ト R1-xEux 2Zr2O7 ノ ケッショウ コウゾウ ト

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R2Zr2O7 and (R1-xEux)2Zr2O7 (R=La, Pr, Sm, Eu, Gd, Tb, Er, Y) were prepared at 1600°C in air and their fluorescence properties were studied. The crystal structures of these compounds were pyrochlorite-type for the light rare earths and CaF2-type for the heavy rare earths, respectively. However, Gd2Zr2O7 and Y2Zr2O7 showed broad and small (111) X-ray diffraction peaks which were characteristic of the pyrochlorite-type structure. Further, annealing at 1500°C increased the intensity and the sharpness of the (111) peak of Gd2Zr2O7. When the compounds were excited by the 254nm line, only the Eu-doped La2Zr2O7, Gd2Zr2O7 and Y2Zr2O7 showed emission spectra due to Eu3+ ions. These spectra and X-ray diffraction, showed that in La2Zr2O7 almost all rare earth ions occupy D3d symmetry sites, but in Y2Zr2O7 and Gd2Zr2O7 most rare earth ions occupy most of the Oh symmetry sites and partially the D3d sites.

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